Réaction #1552106

Équation de réaction

water

3-Hydroxypyridin-2(1H)-one

imidazole

tert-butyldimethylsilyl chloride

→

desired product

Rendement 53.6%

3-(tert-butyldimethylsilanyloxy)-1H-pyridin-2-one

Rendement 53.6%

Solvants

dimethylformamide

dimethylformamide

Conditions de réaction

Traitement

1. 1
   Extractionthe mixture extracted with tert-butyl methyl ether (3×500 mL)
2. 2
   LavageThe combined organic layer was washed with water (300 mL), brine (300 mL)
3. 3
   Séchagethen dried over Na2SO4
4. 4
   AutreThe solvent is removed under reduced pressure
5. 5
   Autrethe crude product crystallized from heptanes

Mode opératoire

3-Hydroxypyridin-2(1H)-one (15 g, 135 mmol) and imidazole (23 g, 338 mmol) were suspended in dimethylformamide (200 mL) under inert atmosphere. A solution of tert-butyldimethylsilyl chloride (20.5 g, 136 mmol) in dimethylformamide (200 mL) is added dropwise at room temperature over 30 minutes. The reaction was then allowed to stir overnight. The resulting solution was then poured into water (300 mL) and the mixture extracted with tert-butyl methyl ether (3×500 mL). The combined organic layer was washed with water (300 mL), brine (300 mL) then dried over Na2SO4. The solvent is removed under reduced pressure and the crude product crystallized from heptanes to afford 16.3 g (53% yield) of the desired product. 1H NMR (250 MHz, CDCl3) δ ppm 12.98 (1H, m); 6.91 (1H, dd, J=1. Hz, J=6.8 Hz); 6.81 (1H, dd, J=1.8 Hz, J=7.2 Hz); 6.02-6.007 (1H, m); 0.90 (9H, s), and 0.17 (6H, s).

Source